Consumption of this tea should be discouraged, as it may be associated with life-threatening lactic acidosis.
Kombucha, popularly called kombucha mushroom, a combination of yeast species and acid forming bacteria, that was quite popular in the US in the mid to late 1990s, but has since not been in the limelight. Some people called it kombucha mushroom but technically it is a symbiosis of several yeast species and bacteria
http://www.raysahelian.com/kombucha.html